Noble Security Master Keyed Dell OptiPlex GX 520/620 Security Kit (1GXMT3-MK) Our Strongest 8mm cable with protective coating to prevent scratching Includes one regular tubular key and tubuler extension key for easy access Custom designed solution for maximum security For use exclusively with the Dell OptiPlex GX520/620 Computers 6 foot cable with Peripheral Trap provides ease of use while unit is secured